Macro fix_tests 

macro_rules! fix_tests {
    (line, $check_fn:ident, $fix_fn:ident) => { ... };
    (ast, $check_fn:ident, $fix_fn:ident) => { ... };
    (ast_tree, $check_fn:ident, $fix_fn:ident) => { ... };
}

Verify fix functions resolve all violations in failing examples.